- Run
sudo vim /etc/default/grub
- Find
GRUB_CMDLINE_LINUX_DEFAULT
- Append
video=hyperv_fb:[the resolution you want]
, for example:GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=hyperv_fb:1920x1080"
- Write the changes, quit Vim
- Run
sudo update-grub
- Run
sudo reboot